How to Know if the Fuel Pump is Damaged and Tips for Repairing It

Understanding how to know if a fuel pump is damaged is very important for car owners. This is because the fuel pump plays several important roles. For example, it pumps fuel from the car's tank and then delivers it to the engine or into the combustion chamber of the car according to the required amount.

In addition, the fuel pump also plays a role in maintaining high fuel flow pressure. So, what happens if the fuel pump is damaged? What are the signs and how can it be repaired? For more details, please pay attention to the review below.

How to Know if the Fuel Pump is Damaged, Here are the Signs!

How to know if the fuel pump is damaged? To determine if there is damage to the car's fuel pump or not, you can pay attention to the following signs.

1. The Car Engine Becomes Difficult to Start

The first sign of a damaged fuel pump is usually indicated by the car engine being difficult to start. A damaged fuel pump causes the car engine not to receive the required fuel supply. This happens due to a blockage in the pump flow caused by a dirty pump or an empty fuel tank.

2. Check Engine Light is On

The second sign is usually the check engine light indicator blinking or turning on. This happens because the check engine is intentionally designed to monitor the condition of engine components. If a malfunction occurs, the check engine indicator will automatically light up.

3. The Sound of the Car Fuel Pump is Weaker

The third sign is that the car fuel pump hums weakly, not as loudly as usual.

4. The Fuel Pump Fuse is Burnt

The fourth sign of damage to the fuel pump is indicated by a burnt fuel pump fuse. This occurs due to dirt that settles and is not addressed immediately or is left for too long.

5. A Strong Gasoline Smell

If the damage is severe, a strong gasoline smell will usually come from the car's exhaust smoke.

Tips for Repairing a Damaged Fuel Pump

How to repair a damaged fuel pump? Here are some tips you can do when the car's fuel pump has problems:

1. Check the Fuel Pump Relay

This component functions to supply electrical current to the fuel pump so that it can pump fuel properly. Here’s how to repair the fuel pump by checking the relay:

Remove the fuel pump relay from its socket.
Ideally, the standard resistance at the terminals should be at 10 kilo Ohms or more. You can check the resistance at terminals 3 and 5.
Then perform further checks on the resistance at terminals 3 and 5, by applying an additional power to terminals 1 and 2. Ensure the result is below 1 Ohm.

2. Check the Fuel Pump Wiring Harness

Here are some steps to check this component:

Use the F/P relay to check terminal FC1. The normal value result is below 1 Ohm.
Check the F/P relay or FC1 with the body ground. Ensure the result is 10 Ohms or more.
Check the connection of the F/P terminal with the fuel pump. The standard value is below 1 Ohm.
Check terminal 3 of the pump motor with the body ground. The standard result is 10 Ohms or more.
Check the flow of terminal 4 of the pump motor with the body ground. The standard value is below 1 Ohm.

3. Check the Pump Resistance

You can check the pump resistance by removing the terminals and measuring the resistance at terminals 3 and 4. The standard normal value is between 0.2-0.3 Ohm at a temperature of 20 degrees Celsius. Excessive resistance can slow down the pump motor's rotation.

4. Avoid Delaying Fuel Refills

Avoid delaying fuel refills; fill up when the fuel is a quarter of the tank volume.

5. Regularly Drain the Tank

Regularly and periodically drain the tank to avoid dirt deposits.

That is a complete review of how to know if the fuel pump is damaged along with tips for repairing it. If you feel less skilled to handle this condition, immediately take your car to a Daihatsu dealer or an official workshop for proper handling.

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